compiling QB64PE programs into Windows screensaver SCR files?

[RhoSigma]

Reading up on them, are these SCR files just EXEs with a different file extension?

Yes, just rename it to .scr, then rightclick and choose "Install" from the contex menu. At least it worked that way until Win10, don't know if Win11 is pickier here.

Also look here: https://qb64phoenix.com/forum/showthread.php?tid=91